Stuffing-box.



W. H. KOBBE.

STUFFING BOX.

APPLICATION FILED NOV.13, 1913.

Patented Feb. 16, 1915.

WILLIAM KOBBiE, 0F PASADENA, CALIFORNIA.

STUFFING-BOX.

Specification of Letters Patent.

Patented Feb. 16, 1915.

Application filed November 13, 1913. Serial No. 800,758.

To all 10. mm it may concern:

Be it known that I, \VILLiAit H. Konnr'z, a citizen of the United States, residing at Pasadena, in the county of Los Angeles and State of California, have invented a new and useful Stufl'ing-Box, of which the following is a specification.

This invention relates to a stufling box and has for its object to provide means for sustaining the polished rod whenever it is desired.

Referring to the drawings: Figure 1 is a side elevationof the stuffing box, showing it as applied to the upper end of the tubing around the polished rod of an oil well. Fi 2 is a vertical longitudinal section throug the stuffing box. Fig. 3 is a view similar to Fig. 2, with a part broken away, the section being on a plane ata diflerent angle than the plane in Fig. 2. Fig. 4.- is a plan view with the cap removed. Fig. '5 is a perspective view of a piece of packing. Fig. 6 is a. perspective of a follower. Fig. 7 is a plan view of the clamps, showing the polished rod in section. Fig. 8 is a sectional view on line m -m*, Fig. '7, through one of the clamps.

1 designates the upper end of the well tubing and 2 designates the polished rod. The stniiing box comprises a head 3 formed with a depending threaded extension 4 which is secured by a coupling 5 to the tubing 1. Resting onthe head 3 is a cap 9 having a depending flange 8, the cap 9 having an annular flange 10 projecting upwardly to form a lubricant cup around the polished rod. The flange 10 is beveled to receive tapered clamp slips a, the inner concave faces of which have gripping teeth 5 which are adapted to grip the polished rod v2. The

- slips 7) are provided with a groove 0 which receives a spring ring (Z, the latter serving to compress the slips against the polished rod 2 with suflicient .pressure to hold the slips on the polished rod when the slips are elevated above the flange 10 when not in use. When the clamps are to be used they are slipped down into position shown in Fig. 2 and the beveled portion of the flange 10 crowds the teeth Z) into gripping engagement with the polished rod 2 and sustains the polished rod 2 with attached string of pump rods to permit the regulation "of the adjuster notshown, after which, upon lifting the rod 2 the clamp slips a may then be readily slid up on the polished rod 2 out of the way, to permit pumping.

The particular construction of the stufling box is immaterial to the present invention and may be of any preferred construction, as for example, as herein shown, the head 3 is formed with a plurality of radial chambers 11 which extend to the central bore of the head and arranged in each chamber 11 is a piece of packing 12. The packing may be of any desired material. The chambers 11 are rectangular in cross section and the packing 12 is of a similar cross sectional shape to substantially fit the same, thereby preventing rotative movement of the packing in its chamber. Within each chamber and bearing against the outer end of the packing 12 is a rectangular follower 13 which may be fed inward by means of a screw 14: which is threaded in the cap 9 and provided with a hand wheel 15. The inner ends of the pieces of packing 12 are thus pressed against the rod 2 and very quickly Wear to the curvature of the rod. The packing 12 fits each chamber 11, and when the end of the packing is worn concave, it will extend over onequarter of the circumference of the rod 2. The cap 9 is retained in position by bolts 16.

Each piece of packing 12 may be individually regulated by its associated screw 14 and it is thus possible to cause all of the pieces of packing to bear with a uniform pressure against the rod 2, even though the pieces may vary in character, density or compressibility. As the" packing wears, the screws 1--L may be set up from time to time to maintain the desired fit and the packing may thus be used until it is entirely worn out. As the main pressure is directly radial, it is possible to secure a. very tight and perfect fit between the rod and packing and the lateral expansion of the packing WhlCh necessarily results in some degree from the inward radial compression of the packing completely fills the chambers.

Whenever it is desiredto renew the packing, the bolts 16 are removed and the cap 9 is lifted up, giving immediate and easy access to the packing. The cup 10- on the cap affords a convenient resting place for the clamps when in use.

The adjustment of the packing is accomplished by the hand wheels 15 without requiring the use of any wrench, and this is of much importance, because it often hapgripping means into engagement with said pens that a stuffing box is-leaking and yet polished rod to support the said gripping there is no convenient tool at hand to slips on the polished rod above the said tighten it. flange. 15 5 What I claim is: In testimony whereof, I have hereunto set In a stufiing box through which the polmy hand at Los Angeles, California, this 7th ished rod is adapted to extend, a beveled day of November, 1913.

flange projecting up from the stuffing box, WILLIAM H. KOBBE. tapered gripping slips engaging and extend- In presence:of- .0 ing above said flange for gripping said pol- G. T. HACKLEY,

ished rod, and spring means pressing said LORA M. BoWERs'. 

